Sewing-machine light with stepped reflecting surfaces



May 15, 1951 SUTTER 2,552,748

SEWING MACHINE LIGHT WITH STEPPED REFLECTING SURFACES Filed Jain. 7, 1946 Patented May 15, 1951 SEWING-MACHINE LIGHT WITH STEPPED REFLECTING SURFACES Hans Suttcr, St. Gallen, Switzerland, assignor to Brutsch & (30., Zurich, Switzerland Application January 7, 1946, Serial No. 639,515

In Switzerland August 9, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires August 9, 1964 3 Claims. 1

The present invention relates to an improved illuminating device for sewing machines, comprising an electrical incandescent lamp fixed to the sewing head and a shade.

According to the invention the shade containing the lamp is a case-part, detachably secured to the front face of the sewing head which part at its lower surface is open and of arched shape in the transverse section, whose portion beneath the filament of the lamp consists of arched sections which are arranged in a step-like manner relative to each other and towards the lamp, so that between these sections slit-like outlet-openings are provided, which openings lie in horizontal planes.

In the accompanying drawing there is shown a preferred embodiment according to the invention.

Fig. 1 is a front end view of the sewing-head of a sewing machine;

Fig. 2 is a sectional view along the line 11-11 of Fig. 1, in enlarged scale;

Fig. 3 is a sectional plan view along the line IIIIII of Fig. 2.

According to the drawing a casing i of arched shape in the transverse section is detachably secured to the front end of the sewing-head of the sewing machine. The upper portion of this casing contains the electric incandescent lamp 2 with its filament 3.

The lower portion of the casing is composed of sections 4 of arched shape which are arranged in a step-like manner downwardly and toward the lamp. In this way slit-like light outlet-openings 5 in horizontal planes are formed between these sections. The portion of the shade consist ing of arch-like sections lies below the filament of the lamp. According to the horizontal course of the light outlet-openings the luminous rays from the filament 3 of the electric incandescent lamp 2 can only leave to the bottom and the latter illuminate the work-piece in a circumference in front and beneath the small presser foot of the machine.

Furthermore, as is clearly apparent from Figs. 2 and 3, the parts 4 present interior deflection surfaces for the light rays which surfaces lie at an acute angle with relation to the lamp axis and materially aid in reflecting the light onto the work space. More specifically, upon reference to Figure 2, it is to be noted that the lower border of the upper part of the casing covering the lamp projects outwardly as shown at 6 and the interior faces of the next two lower sections are formed by two curved faces disposed at an acute angle as shown at i, while the interior face of the lowest section constitutes a curved plane face inclined at an acuate angle relative to the axis of the lamp as shown at 8. It is thus apparent from the drawing that each of the sections 4 has reflecting surfaces which lie in a common inclined plane that is transversely arcuate.

In order that the luminous rays emanating from the light outlet-openings can blend from one to the other i. e. can overlap themselves on the working planes of the sewing machine, the edges of the arch-like sections of the shade, which edges circumscribe the slit-like light outlet-openings, are sharpened.

What I claim is:

1. An illuminating device for sewing machines including in combination, an electric incandescent lamp arranged at the sewing head of the machine, a casing part detachably secured on the working side of the machine and covering the lamp at the upper part and being open at its lower face, said casing part having an arched shape in the transverse section and horizontal lying parallel arched sections below the filament of the lamp, said sections being arranged in a step-like manner towards the lamp in such a way that between these sections slit-like light outlet openings are provided lying in horizontal planes, at least a portion of the interior faces of the sections being inclined to the axis of the lamp at an acute angle to reflect the rays inwardly and downwardly to concentrate the light rays on the work place of the table.

2. An illuminating device for sewing machines including in combination, an electric incandescent lamp provided at the sewing head of the machine, a casing part detachably secured on the working side of the machine and covering the lamp at the upper part and being open at its lower face, said casing part having an arched shape in the transverse section and horizontal lying parallel arched sections below the filament of the lamp, said sections being arranged in a step-like manner towards the lamp in such a way that between these sections slit-like light outlet openings are provided lying in horizontal planes, the lower border of the upper part of the casing covering the lamp projecting outwardly, the interior faces of the next two lower arched sections having two surfaces disposed at an obtuse angle relative to each other, and the interior face of the lowest arched section being inclined at an acute angle to the axis of the lamp.

3. An illuminating device for sewing machines including a casing detachably secured on the working side of the machine adjacent the sewing head thereof, an electric incandescent lamp mounted within said casing, said casing having an arcuate "wall adjacent the lamp and being open at its lowerface at an area substantially in alignment with the axis of the lamp, a plural- I ity of arcuate reflecting sections disposed in stepped laterally spaced relationship with respect to the axis of the lamp with .theJlower-isection nearer said axis, the spacing between the sections providing light outlet openings toprovide ,illumination exteriorly of the casing and eachgsection having at least one reflecting surface inclined to the axis of the lamp toreflect light rays inwardly and downwardly to concentrate the light rays at the working area of the sewing machine, said reflecting sections lying in a common arcuate inclined plane.

HANS SU'ITER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS .10 Number Name Date 2,033,235 Ferree et a1 Mar. 10, 1936 i'2,208,522 Cnllman July 16, 1940 2,226,689 'Barber Dec. 31, 1940 2 ,267,796 Lezebnick Dec. 30, 1941 15 '-2,370;084 Smith Feb. 20, 1945 

